The return value is a two-column integer matrix. Column one represents the unique ids of the input vector, column two the respective number of occurrences / counts.

ids_to_count_matrix(ids)

Arguments

ids

a vector of ids (integer values)

Examples

ids <- c(1L, 5L, 5L, 7L, 7L, 7L, 7L) ids_to_count_matrix(ids)
#> [,1] [,2] #> [1,] 1 1 #> [2,] 5 2 #> [3,] 7 4
table(ids) # alternative to get a similar result
#> ids #> 1 5 7 #> 1 2 4